//** Ajax Tabs Content script v2.0- © Dynamic Drive DHTML code library (http://www.dynamicdrive.com)
//** Updated Oct 21st, 07 to version 2.0. Contains numerous improvements

var ddajaxtabssettings={}
ddajaxtabssettings.bustcachevar=1  //bust potential caching of external pages after initial request? (1=yes, 0=no)
ddajaxtabssettings.loadstatustext="<img src='img/loading.gif' /> Requesting content..."


////NO NEED TO EDIT BELOW////////////////////////

function ddajaxtabs(tabinterfaceid, contentdivid){
  this.tabinterfaceid=tabinterfaceid //ID of Tab Menu main container
  this.tabs=document.getElementById(tabinterfaceid).getElementsByTagName("a") //Get all tab links within container
  this.enabletabpersistence=true
  this.hottabspositions=[] //Array to store position of tabs that have a "rel" attr defined, relative to all tab links, within container
  this.contentdivid=contentdivid
  this.defaultHTML=""
  this.defaultIframe='<iframe src="about:blank" marginwidth="0" marginheight="0" frameborder="0" vspace="0" hspace="0" class="tabcontentiframe" style="width:100%; height:auto; min-height: 100px"></iframe>'
  this.defaultIframe=this.defaultIframe.replace(/<iframe/i, '<iframe name="'+"_ddajaxtabsiframe-"+contentdivid+'" ')
this.revcontentids=[] //Array to store ids of arbitrary contents to expand/contact as well ("rev" attr values)
  this.selectedClassTarget="link" //keyword to indicate which target element to assign "selected" CSS class ("linkparent" or "link")
}

ddajaxtabs.connect=function(pageurl, tabinstance){
  var page_request = false
  var bustcacheparameter=""
  if (window.XMLHttpRequest) // if Mozilla, IE7, Safari etc
    page_request = new XMLHttpRequest()
  else if (window.ActiveXObject){ // if IE6 or below
    try {
    page_request = new ActiveXObject("Msxml2.XMLHTTP")
    }
    catch (e){
      try{
      page_request = new ActiveXObject("Microsoft.XMLHTTP")
      }
      catch (e){}
    }
  }
  else
    return false
  var ajaxfriendlyurl=pageurl.replace(/^http:\/\/[^\/]+\//i, "http://"+window.location.hostname+"/")
  page_request.onreadystatechange=function(){ddajaxtabs.loadpage(page_request, pageurl, tabinstance)}
  if (ddajaxtabssettings.bustcachevar) //if bust caching of external page
    bustcacheparameter=(ajaxfriendlyurl.indexOf("?")!=-1)? "&"+new Date().getTime() : "?"+new Date().getTime()
  page_request.open('GET', ajaxfriendlyurl+bustcacheparameter, true)
  page_request.send(null)
}

ddajaxtabs.loadpage=function(page_request, pageurl, tabinstance){
  var divId=tabinstance.contentdivid
  document.getElementById(divId).innerHTML=ddajaxtabssettings.loadstatustext //Display "fetching page message"
  if (page_request.readyState == 4 && (page_request.status==200 || window.location.href.indexOf("http")==-1)){
    document.getElementById(divId).innerHTML=page_request.responseText
    ddajaxtabs.ajaxpageloadaction(pageurl, tabinstance)
  }
}

ddajaxtabs.ajaxpageloadaction=function(pageurl, tabinstance){
  tabinstance.onajaxpageload(pageurl) //call user customized onajaxpageload() function when an ajax page is fetched/ loaded
}

ddajaxtabs.getCookie=function(Name){
  var re=new RegExp(Name+"=[^;]+", "i"); //construct RE to search for target name/value pair
  if (document.cookie.match(re)) //if cookie found
    return document.cookie.match(re)[0].split("=")[1] //return its value
  return ""
}

ddajaxtabs.setCookie=function(name, value){
  document.cookie = name+"="+value+";path=/" //cookie value is domain wide (path=/)
}

ddajaxtabs.prototype={

  expandit:function(tabid_or_position){ //PUBLIC function to select a tab either by its ID or position(int) within its peers
    this.cancelautorun() //stop auto cycling of tabs (if running)
    var tabref=""
    try{
      if (typeof tabid_or_position=="string" && document.getElementById(tabid_or_position).getAttribute("rel")) //if specified tab contains "rel" attr
        tabref=document.getElementById(tabid_or_position)
      else if (parseInt(tabid_or_position)!=NaN && this.tabs[tabid_or_position].getAttribute("rel")) //if specified tab contains "rel" attr
        tabref=this.tabs[tabid_or_position]
    }
    catch(err){alert("Invalid Tab ID or position entered!")}
    if (tabref!="") //if a valid tab is found based on function parameter
      this.expandtab(tabref) //expand this tab
  },

  setpersist:function(bool){ //PUBLIC function to toggle persistence feature
      this.enabletabpersistence=bool
  },

  loadajaxpage:function(pageurl){ //PUBLIC function to fetch a page via Ajax and display it within the Tab Content instance's container
    ddajaxtabs.connect(pageurl, this)
  },

  loadiframepage:function(pageurl){ //PUBLIC function to fetch a page and load it into the IFRAME of the Tab Content instance's container
    this.iframedisplay(pageurl, this.contentdivid)
  },

  setselectedClassTarget:function(objstr){ //PUBLIC function to set which target element to assign "selected" CSS class ("linkparent" or "link")
    this.selectedClassTarget=objstr || "link"
  },

  getselectedClassTarget:function(tabref){ //Returns target element to assign "selected" CSS class to
    return (this.selectedClassTarget==("linkparent".toLowerCase()))? tabref.parentNode : tabref
  },

  onajaxpageload:function(pageurl){ //PUBLIC Event handler that can invoke custom code whenever an Ajax page has been fetched and displayed
    //do nothing by default
  },

  expandtab:function(tabref){
    var relattrvalue=tabref.getAttribute("rel")
    //Get "rev" attr as a string of IDs in the format ",john,george,trey,etc," to easy searching through
    var associatedrevids=(tabref.getAttribute("rev"))? ","+tabref.getAttribute("rev").replace(/\s+/, "")+"," : ""
    if (relattrvalue=="#default")
      document.getElementById(this.contentdivid).innerHTML=this.defaultHTML
    else if (relattrvalue=="#iframe")
      this.iframedisplay(tabref.getAttribute("href"), this.contentdivid)
    else
      ddajaxtabs.connect(tabref.getAttribute("href"), this)
    this.expandrevcontent(associatedrevids)
    for (var i=0; i<this.tabs.length; i++){ //Loop through all tabs, and assign only the selected tab the CSS class "selected"
      this.getselectedClassTarget(this.tabs[i]).className=(this.tabs[i].getAttribute("href")==tabref.getAttribute("href"))? "selected" : ""
    }
    if (this.enabletabpersistence) //if persistence enabled, save selected tab position(int) relative to its peers
      ddajaxtabs.setCookie(this.tabinterfaceid, tabref.tabposition)
  },

  iframedisplay:function(pageurl, contentdivid){
    if (typeof window.frames["_ddajaxtabsiframe-"+contentdivid]!="undefined"){
      try{delete window.frames["_ddajaxtabsiframe-"+contentdivid]} //delete iframe within Tab content container if it exists (due to bug in Firefox)
      catch(err){}
    }
    document.getElementById(contentdivid).innerHTML=this.defaultIframe
    window.frames["_ddajaxtabsiframe-"+contentdivid].location.replace(pageurl) //load desired page into iframe
  },


  expandrevcontent:function(associatedrevids){
    var allrevids=this.revcontentids
    for (var i=0; i<allrevids.length; i++){ //Loop through rev attributes for all tabs in this tab interface
      //if any values stored within associatedrevids matches one within allrevids, expand that DIV, otherwise, contract it
      document.getElementById(allrevids[i]).style.display=(associatedrevids.indexOf(","+allrevids[i]+",")!=-1)? "block" : "none"
    }
  },

  autorun:function(){ //function to auto cycle through and select tabs based on a set interval
    var currentTabIndex=this.automode_currentTabIndex //index within this.hottabspositions to begin
    var hottabspositions=this.hottabspositions //Array containing position numbers of "hot" tabs (those with a "rel" attr)
    this.expandtab(this.tabs[hottabspositions[currentTabIndex]])
    this.automode_currentTabIndex=(currentTabIndex<hottabspositions.length-1)? currentTabIndex+1 : 0 //increment currentTabIndex
  },

  cancelautorun:function(){
    if (typeof this.autoruntimer!="undefined")
      clearInterval(this.autoruntimer)
  },

  init:function(automodeperiod){
    var persistedtab=ddajaxtabs.getCookie(this.tabinterfaceid) //get position of persisted tab (applicable if persistence is enabled)
    var persisterror=true //Bool variable to check whether persisted tab position is valid (can become invalid if user has modified tab structure)
    this.automodeperiod=automodeperiod || 0
    this.defaultHTML=document.getElementById(this.contentdivid).innerHTML
    for (var i=0; i<this.tabs.length; i++){
      this.tabs[i].tabposition=i //remember position of tab relative to its peers
      if (this.tabs[i].getAttribute("rel")){
        var tabinstance=this
        this.hottabspositions[this.hottabspositions.length]=i //store position of "hot" tab ("rel" attr defined) relative to its peers
        this.tabs[i].onclick=function(){
          tabinstance.expandtab(this)
          tabinstance.cancelautorun() //stop auto cycling of tabs (if running)
          return false
        }
        if (this.tabs[i].getAttribute("rev")){ //if "rev" attr defined, store each value within "rev" as an array element
          this.revcontentids=this.revcontentids.concat(this.tabs[i].getAttribute("rev").split(/\s*,\s*/))
        }
        if (this.enabletabpersistence && parseInt(persistedtab)==i || !this.enabletabpersistence && this.getselectedClassTarget(this.tabs[i]).className=="selected"){
          this.expandtab(this.tabs[i]) //expand current tab if it's the persisted tab, or if persist=off, carries the "selected" CSS class
          persisterror=false //Persisted tab (if applicable) was found, so set "persisterror" to false
          //If currently selected tab's index(i) is greater than 0, this means its not the 1st tab, so set the tab to begin in automode to 1st tab:
          this.automode_currentTabIndex=(i>0)? 0 : 1
        }
      }
    } //END for loop
    if (persisterror) //if an error has occured while trying to retrieve persisted tab (based on its position within its peers)
      this.expandtab(this.tabs[this.hottabspositions[0]]) //Just select first tab that contains a "rel" attr
    if (parseInt(this.automodeperiod)>500 && this.hottabspositions.length>1){
      this.automode_currentTabIndex=this.automode_currentTabIndex || 0
      this.autoruntimer=setInterval(function(){tabinstance.autorun()}, this.automodeperiod)
    }
  } //END int() function

} //END Prototype assignment